Ball-column hybrid cutter bearing

Abstract

The utility model provides a ball-cylinder hybrid roller cutter bearing, comprising a cutter shaft arranged as an inner ring, a roller cutter body arranged as an outer ring, a plurality of rows of rolling elements arranged between the cutter shaft and the roller cutter body, the plurality of rolling elements at least comprising cylindrical rollers distributed at both axial ends of the cutter shaft, and ball rollers sandwiched between the two rows of cylindrical rollers, the ball rollers corresponding to the axial load of the bearing, the cylindrical rollers corresponding to the radial load of the bearing, a ball loading channel being provided at one axial end of the cutter shaft, the other end of the ball loading channel being connected to a raceway of the ball roller corresponding to the outer circumference of the cutter shaft, rollers being installed at the cutter shaft through the ball loading channel, so that adding or replacing rolling elements is convenient, making maintenance and replacement work simpler and faster, and the combined design of ball rollers and cylindrical rollers is conducive to more evenly distributing the load, reducing stress concentration of a single rolling element, and improving the overall performance of the bearing.

Description

Technical Field

[0001] The utility model relates to a ball-column hybrid roller bearing. Background Art

[0002] With the rapid development of the national economy, people's demand for quality of life and convenient transportation is increasing, and the country is also increasing its investment in infrastructure. Therefore, the construction of high-speed railway tunnels is also becoming more frequent, which plays a vital role in the use of tunnel boring machines and the cutter heads attached to their cutter heads; the use of bearings inside them is also extremely considerable.

[0003] Cutter bearings are an important component used in engineering machinery such as shield machines. They mainly bear the radial and axial forces generated by the cutter during rock breaking. The reliability and performance of this bearing have a significant impact on the excavation operation and consumption of the cutter. Cutter bearings are special parts for shield machine engineering equipment. Their market demand is greatly affected by domestic infrastructure construction. With the increase in demand for shield machines, the demand for cutter bearings is also rising.

[0004] The current roller cutter bearings are not suitable for heavy-load applications and cannot meet the conditions of combined axial and radial loads and overturning moments. The rolling elements inside the bearings cannot fully withstand the axial and radial loads. Since the inner and outer rings of the roller cutter bearings are the cutter shaft and the roller cutter body respectively, the assembly of the intermediate ball is extremely difficult. There is also a lack of structures that facilitate the installation of roller cutter bearings, which affects the efficiency of assembly. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a ball-column hybrid roller cutter bearing.

[0006] To achieve the above-mentioned purpose, the utility model provides a ball-cylinder hybrid roller cutter bearing, including a cutter shaft arranged as an inner ring and a roller cutter body arranged as an outer ring, a plurality of rows of rolling elements are arranged between the cutter shaft and the roller cutter body, the plurality of rolling elements at least include cylindrical rollers distributed at both axial ends of the cutter shaft and ball rollers sandwiched between the two rows of cylindrical rollers, the ball rollers correspond to the axial load of the bearing, the cylindrical rollers correspond to the radial load of the bearing, a ball loading channel is opened at one axial end of the cutter shaft, and the other end of the ball loading channel is connected to the raceway of the ball roller corresponding to the outer circumference of the cutter shaft.

[0007] Furthermore, the outer diameter of the hob cutter body is gradually reduced in the axial direction, and the cylindrical roller near the end of the hob cutter body with a larger outer diameter is larger than the cylindrical roller near the end of the hob cutter body with a smaller outer diameter.

[0008] Furthermore, a plug adapted to be plugged in is provided in the ball loading channel, a positioning hole is provided in the part of the plug plugged in the ball loading channel, a positioning groove is provided on the side wall of the ball loading channel, the knife shaft is provided with a plug-in groove connected to the ball loading channel, a positioning pin is plugged in the plug-in groove, and the positioning pin is positioned and plugged in the positioning groove through the positioning hole on the plug to lock the plug.

[0009] Furthermore, the inner circumferential wall of the hob body is provided with raceways corresponding to the two rows of cylindrical rollers and the ball rollers.

[0010] Furthermore, the ball roller is a deep groove ball structure, and has a contact point with the cutter shaft and the cutter body respectively.

[0011] Furthermore, the ball roller has a four-point ball structure, and has two contact points with the cutter shaft and the cutter body respectively.

[0012] The beneficial effects of the utility model are as follows: the ball-cylinder hybrid design enables the bearing of the utility model to be suitable for heavy-load conditions with low rotation speed, and has strong load-bearing capacity: it can withstand combined loads: it can withstand large axial and radial combined loads, as well as the additional overturning moment generated by the axial radial load; the ball roller mainly bears the axial load, and the radial load is borne by the cylindrical rollers on both sides, so that the bearing can withstand loads in multiple directions at the same time, thereby improving the stability and reliability of the bearing; the rollers are installed on the knife shaft through the ball loading channel, which facilitates the addition or replacement of rolling elements, making maintenance and replacement work simpler and faster; the combined design of the ball roller and the cylindrical roller helps to distribute the load more evenly, reduce the stress concentration of a single rolling element, and improve the overall performance of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The following is a further explanation of the embodiments of the utility model in conjunction with the accompanying drawings: as shown in the figure, the ball-cylinder hybrid roller cutter bearing includes a cutter shaft 1 arranged as an inner ring, a cutter body 2 arranged as an outer ring, a plurality of rows of rolling elements are arranged between the cutter shaft 1 and the cutter body 2, the plurality of rolling elements at least include cylindrical rollers 3 distributed at both axial ends of the cutter shaft 1, and ball rollers 4 sandwiched between the two rows of cylindrical rollers 3, the ball rollers 4 correspond to the axial load of the bearing, the cylindrical rollers 3 correspond to the radial load of the bearing, a ball loading channel 5 is opened at one axial end of the cutter shaft 1, and the other end of the ball loading channel 5 is connected to the raceway of the ball roller 4 corresponding to the outer circumference of the cutter shaft 1.

[0015] The outer diameter of the hob body 2 is set to gradually decrease along the axial direction, and the cylindrical roller 3 near the end of the hob body 2 with a larger outer diameter is larger than the cylindrical roller 3 near the end of the hob body 2 with a smaller outer diameter. Optimize the load distribution. As the outer diameter of the hob body 2 is set to gradually decrease, the size of the cylindrical roller 3 also changes accordingly, so that the load can be distributed more reasonably, ensuring that the rolling elements at different positions can evenly bear the corresponding load, and improving the overall load-bearing capacity and stability.

[0016] The ball loading channel 5 is provided with a plug 6 adapted to be plugged therein, a positioning hole is provided in the portion of the plug 6 plugged into the ball loading channel 5, a positioning groove 7 is provided on the side wall of the ball loading channel 5, and the knife shaft 1 is provided with a plug-in groove 8 connected to the ball loading channel 5, a positioning pin 9 is plugged in the plug-in groove 8, and the positioning pin 9 is positioned and plugged into the positioning groove 7 through the positioning hole on the plug 6 to form a locking of the plug 6. The setting of the plug 6 blocks the ball loading channel 5, limits the ball roller 4, prevents the rolling body in the ball loading channel 5 from accidentally falling off, ensures the integrity of the bearing structure, and plugs in the positioning hole on the plug 6 by aligning the positioning pin 9 with the positioning hole, and the other end of the positioning pin 9 is plugged into the positioning groove 7 on the side wall of the ball loading channel 5 to form a locking of the plug 6, prevent the plug 6 from loosening, and improve stability. The design of the plug 6 allows the plug 6 to be easily removed to access the ball loading channel 5 when the rolling element needs to be replaced or maintained, thereby simplifying the maintenance and replacement process.

[0017] The ball loading channel is arranged on the outer peripheral wall of the cutter shaft near the axial end, and the ball loading channel is arranged obliquely in the axial section, and is inclinedly guided from the outer peripheral wall of the cutter shaft end to the raceway of the corresponding ball roller, so as to facilitate the guiding installation of the ball roller. The plug slot 8 is arranged at an angle with the ball loading channel, and the angle is set at 90 degrees. The plug 6 is locked by inserting the positioning pin 9 arranged in the plug slot 8 into the positioning hole on the plug 6. Such an arrangement facilitates the locking of the plug 6 by the positioning pin 9.

[0018] The inner circumferential wall of the hob body 2 is provided with raceways corresponding to the two rows of cylindrical rollers 3 and the ball rollers 4 .

[0019] The ball roller 4 is a deep groove ball structure, and has one contact point with the cutter shaft 1 and the cutter body 2. The ball roller 4 can be a deep groove ball structure between the inner and outer rings, and is suitable for applications requiring higher rotation accuracy.

[0020] The ball roller 4 has a four-point ball structure, and has two contact points with the cutter shaft 1 and the cutter body 2. The ball roller 4 can have a four-point ball structure between the inner and outer rings, and the ball roller 4 has two contact points with the cutter shaft 1 and the cutter body 2, which is suitable for applications that need to withstand large axial loads and heavy-load working conditions.

[0021] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A ball-column hybrid cutter bearing, comprising a cutter shaft as an inner ring and a cutter body as an outer ring, characterized in that: A plurality of rows of rolling bodies are arranged between the cutter shaft and the roller body, and the plurality of rolling bodies at least include cylindrical rollers distributed at both axial ends of the cutter shaft and ball rollers sandwiched between the two rows of cylindrical rollers. The ball rollers correspond to the axial load of the bearing, and the cylindrical rollers correspond to the radial load of the bearing. A ball loading channel is opened at one axial end of the cutter shaft, and the other end of the ball loading channel is connected to the raceway of the ball roller corresponding to the outer circumference of the cutter shaft.

2. The ball-column hybrid roller cutter bearing according to claim 1, characterized in that: The outer diameter of the hob cutter body is gradually reduced in the axial direction, and the cylindrical roller near the end of the hob cutter body with a larger outer diameter is larger than the cylindrical roller near the end of the hob cutter body with a smaller outer diameter.

3. The ball-column hybrid roller cutter bearing according to claim 1, characterized in that: The ball loading channel is provided with a plug adapted to be plugged therein, a positioning hole is provided at the portion of the plug plugged in the ball loading channel, a positioning groove is provided on the side wall of the ball loading channel, the knife shaft is provided with a plug-in groove connected to the ball loading channel, a positioning pin is plugged in the plug-in groove, and the positioning pin is positioned and plugged in the positioning groove through the positioning hole on the plug to lock the plug.

4. The ball-column hybrid roller cutter bearing according to claim 1, characterized in that: The inner peripheral wall of the hob body is provided with raceways corresponding to the two rows of cylindrical rollers and the ball rollers.

5. The ball-column hybrid roller cutter bearing according to claim 4, characterized in that: The ball roller is a deep groove ball structure, and has a contact point with the cutter shaft and the cutter body respectively.

6. The ball-column hybrid roller cutter bearing according to claim 4, characterized in that: The ball roller is a four-point ball structure, and has two contact points with the cutter shaft and the cutter body respectively.

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